Guy,
Thanks for the mention. As I recall, when the discussion on this was hot, I came around to accepting that the "intention" of the design appeared to be to clamp the inner tubes together between the frame plates by using the spindle for the clamping force. This also required my accepting the opinion of folks more experienced than myself at the time (so they still would be), that the rubber can flex (without destruction) within the angle of arc generated by the movement of the swingarm. All fine, I suppose, for accepting the intention, however, there is a "however." I would be very surprised if the clamping force against the inner tubes held up very long, after which the pivoting is all around the spindle as an axle. It is pretty common to see egg-shapped spindle holes in the frame flanges.
As for dimensions, my swingarm measures 234.2 mm and the distance between the flanges measures 236.5 mm. Both of these measurements are with the swingarm out of the frame.
Richard L.